1. DAIS for RDF BOF Isao Kojima kojima@ni.aist.go.jp Data Grid Team Grid Technology Research Center AIST Japan http://www.dbgrid.org/

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3. Introduction Who am I? Isao Kojima AIST, Japan Currently leading following AIST datagrid research topics related with RDFCurrently leading following AIST datagrid research topics related with RDF –OGSA-DAI-RDF : Extending OGSA-DAI world to the Semantic Web RDF processing OGSA-DAI Activities Query language SPARQL –RDFCube: P2P based Distributed RDF Query Processing Construct a special index structure on top of DHT Provides efficient RDF set-oriented operation –S-MDS : enhance MDS4 framework to support “S”(semantics) Supports OWL-S ontology for data/computing resources Supports Continual RDF Query for dynamic resource monitoring –Target: Large scale distributed RDF data –Approach: Query language based application

4. RDF (Resource Description Framework) Logic Rules Proof Trusted SW Ontology RDF Schema Namespaces Unicode RDF XML URI SignatureEncryption Common metadata/knowledge description in Semantic Web Applications Number of RDF data is increasing=>Need for database technology/specs http:// gtrc.aist.go.jp /~a.matono matono creator subject predicate <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax- ns#" xmlns:dc="http://dublincore.org/2001/08/14/dces#"> matono Layer Cake of the Semantic Web XML-based Format object Statement: “creator of “http://gtrc.aist.go.jp/~a.matono/ is matono” DAIS NOW DAIS Next?

5. DAIS for RDF: initial proposal http://www.dbgrid.org/dais-recharter-bof.htm http://www.dbgrid.org/dais-recharter-bof.htm Focus/Purpose RDF (resource description framework) is a standard framework for expressing semantic metadata and is widely used in semantic web and semantic grid applications. An enormous amount of RDF data has been created and stored in various applications and research projects. The query language SPARQL is currently under discussion at W3C as a standard query language for RDF. DAIS-WG, which aims to provide a standard interface for databases, should cover RDF databases within the OGSA-based grid framework. Scope: Setting RDF data access specification (WS-DAI-RDF) based on the existing WS-DAI specification, which is discussed within the DAIS-WG.

6. What we want to do (Detail of the DAIS specs will be given by DAIS-WG) WS-DAI WS-DAIRWS-DAIXFilesWS-DAIO Sets general pattern for other DAIS realizations. Currently being defined In DAIS Draft based on Posix. Looking for a willing author. WS-DAI-RDF (&WS-DAI-Ont?) Will be defined in DAIS Looking for more authors

7. Aim of the BOF (Formally) Re-chartering of current DAIS-WG – to add RDF specialization –(we must set goals, milestones and deliverables) BOF= 1 st Step to Share the Motivation & Information –GGF: DAIS-WG –GGF: Semantic Grid RG –W3C: Data Access Working Group (SPARQL) –Systems and Applications –R&D activities Discussion –Scope –Approach –Schedule & Outputs

8. Agenda Introduction & Background –Motivation for the BOF – Related GGF Specs and Research Activities –DAIS WG: Dave Pearson –Semantic Grid RG: Carole Goble R&D Projects (current potential candidates for the reference implementations) –Ontogrid,WS-DAI-Ont : Asuncion Gomez Perez –OGSA-DAI-RDF & –Related Issues : Isao Kojima If anybody want to present something, feel free to present here. Discussion:

11. OGSA-DAI-RDF and Related Topics Isao Kojima Data Grid Team Grid Technology Research Center AIST Japan

12. OGSA-DAI-RDF implementation – Add RDF database type to uk e-Science OGSA-DAI database middleware – RDF handling Activities including SPARQL QueryStatementActivity – Provides GUI for SPARQL – Supports OWL/RDFS ontology – Supports Jena and Sesame DBMS Oriented Research （ currently focus on the Query language) Presented Yesterday at Semantic Grid Workshop Presentation is on http://www.semanticgrid.org/GGF/ggf16/ andhttp://www.semanticgrid.org/GGF/ggf16/ soon also on our Website. RDF(SPARQL) Activities

13. Query Language:What is SPARQL? SQL-like RDF Query Language PREFIX rdf: PREFIX dc: PREFIX : SELECT ?book ?title WHERE { ?t rdf:subject ?book. ?t rdf:predicate dc:title. ?t rdf:object ?title. ?t :saidBy " Bob". } Will be standard at W3C data access working group (DAWG) Current: Last call working draft: comments due 10 th Feb. “SPARQL Query Result XML Format” is also on the same schedule...

14. SPARQL example on OGSA-DAI-RDF

15. Distributed SPARQL Processing using OGSA-DAI Activity Framework

16. Related Issues

17. DAIS for RDF Products: –RDF database systems Jena Sesame Oracle RDF option etc… Specifications : –W3C RDF-related standards –RDF Query Language SPARQL will be W3C standard SPARQL/XML format SPARQL protocol Grid-based R&D Projects : –OGSA-DAI-RDF (by AIST) –Ontogrid WS-DAI-Ont & WS-DAI-Ont-RDF (Ontogrid) RDF storage is now commonly used and the impact of the spec will be large Little need to rely on unstable specs We already have 2 potential candidates for reference implementations for coming WS-DAI-RDF/Ontology

18. DAIS and SPARQL Protocol W3C Data Access Working Group defined SPARQL interface protocol –WSDL1.1 and HTTP binding are discussed. Working Draft is on the same schedule with SPARQL,SPARQL/XML (HTTP) Simple interface –No WSRF –No GSI(login)

19. SPARQL protocol and WS-DAI (and WS-DAI-RDF) Must have some interoperability Technical problem: must be discussed. Liaison with W3C activity : if needed. –W3C RDF DAWG (Data Access Working Group) –Current Possible Contact Person: Hiroyuki Sato (NTT) will help us.

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21. Discussions Scope & Target Discussion Format Goals Milestones/Schedules Deliverables …….

22. Initial proposal was: Goals The following will be added to the current DAIS goals/milestones. Data Service Specification: RDF Realization (ontology?) Milestones Sep 2006: Initial draft of the WS-DAI-RDF specifications, which is consistent with WS-DAI and the OGSA data architecture. March 2007: Revised draft of the WS-DAI-RDF specifications. June 2007: Final specifications, submitted as a recommendation GGF Document GGF Recommendation (Due June 2007) Web Services Data Access and Integration – The RDF Realization (WS-DAI-RDF) small scope, short term activity

23. Scope & Target Rules Proof Trusted SW Ontology RDF Schema Namespaces Unicode RDF XML URI SignatureEncryption DAIS Next? Logic

24. Discussions Scope & Target Discussion Format Goals Milestones/Schedules Deliverables …….